add redefine listener (#6309)

CHANGES.md

@@ -9,6 +9,8 @@ Release Notes.
 
 #### Java Agent
 * Remove invalid mysql configuration in agent.config.
+* Add net.bytebuddy.agent.builder.AgentBuilder.RedefinitionStrategy.Listener 
+  to show detail message when redifine errors occur
 
 
 #### OAP-Backend

apm-sniffer/apm-agent/src/main/java/org/apache/skywalking/apm/agent/SkyWalkingAgent.java

@@ -19,7 +19,9 @@
 package org.apache.skywalking.apm.agent;
 
 import java.lang.instrument.Instrumentation;
+import java.util.Collections;
 import java.util.List;
+import java.util.Map;
 
 import net.bytebuddy.ByteBuddy;
 import net.bytebuddy.agent.builder.AgentBuilder;
@@ -123,6 +125,7 @@ public class SkyWalkingAgent {
         agentBuilder.type(pluginFinder.buildMatch())
                     .transform(new Transformer(pluginFinder))
                     .with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)
+                    .with(new RedefinitionListener())
                     .with(new Listener())
                     .installOn(instrumentation);
 
@@ -215,4 +218,23 @@ public class SkyWalkingAgent {
         public void onComplete(String typeName, ClassLoader classLoader, JavaModule module, boolean loaded) {
         }
     }
+
+    private static class RedefinitionListener implements AgentBuilder.RedefinitionStrategy.Listener {
+
+        @Override
+        public void onBatch(int index, List<Class<?>> batch, List<Class<?>> types) {
+            /* do nothing */
+        }
+
+        @Override
+        public Iterable<? extends List<Class<?>>> onError(int index, List<Class<?>> batch, Throwable throwable, List<Class<?>> types) {
+            LOGGER.error(throwable, "index={}, batch={}, types={}", index, batch, types);
+            return Collections.emptyList();
+        }
+
+        @Override
+        public void onComplete(int amount, List<Class<?>> types, Map<List<Class<?>>, Throwable> failures) {
+            /* do nothing */
+        }
+    }
 }